[netdevice] Record whether or not interrupts are currently enabled

Signed-off-by: Michael Brown <mcb30@etherboot.org>

src/include/gpxe/netdevice.h

 /** Network device is open */
 #define NETDEV_OPEN 0x0001
 
+/** Network device interrupts are enabled */
+#define NETDEV_IRQ_ENABLED 0x0002
+
 /** Link-layer protocol table */
 #define LL_PROTOCOLS __table ( struct ll_protocol, "ll_protocols" )
 
 	return ( netdev->state & NETDEV_OPEN );
 }
 
+/**
+ * Check whether or not network device interrupts are currently enabled
+ *
+ * @v netdev		Network device
+ * @v irq_enabled	Network device interrupts are enabled
+ */
+static inline __attribute__ (( always_inline )) int
+netdev_irq_enabled ( struct net_device *netdev ) {
+	return ( netdev->state & NETDEV_IRQ_ENABLED );
+}
+
 extern void netdev_link_down ( struct net_device *netdev );
 extern int netdev_tx ( struct net_device *netdev, struct io_buffer *iobuf );
 extern void netdev_tx_complete_err ( struct net_device *netdev,

src/net/netdevice.c

  * @v enable		Interrupts should be enabled
  */
 void netdev_irq ( struct net_device *netdev, int enable ) {
+
+	/* Enable or disable device interrupts */
 	netdev->op->irq ( netdev, enable );
+
+	/* Record interrupt enabled state */
+	netdev->state &= ~NETDEV_IRQ_ENABLED;
+	if ( enable )
+		netdev->state |= NETDEV_IRQ_ENABLED;
 }
 
 /**